Transcript for Instant Index: ABC News President Ben Sherwood Named Co-Chairman of ABC Television Group

At the top of our "Instant index," tonight, a provocative new clue about trouble having a baby. A new study finds the more stress a woman has the harder it is to get pregnant. Searchers measured enzymes found in saliva, found that women with the highest levels of stress were more than twice as likely to be infertile. The researchers recommend yoga, meditation, anything to bring those stress levels down. And now, sit back, close your eyes and see if you can hear the star power in this voice. ? How many travelers get weary ? The man in black, Johnny cash. It's been 11 years since he died. But that song is off his new album, recorded in 1984. It has been sitting on the shelf. And tonight, his family is calling these songs, Johnny cash at his prime, shining, his spirit alive, out among the stars comes out tomorrow. And we have some exciting news to share from our ABC news family. Ben Sherwood, who has led our news division the past three years was named today as the next co-chairman of Disney media networks and president of Disney ABC television group. The far-reaching programming and strength of ABC. He'll take over when Anne Sweeney steps down early next year. And he has infused this news division with energy, a passionate spirit and a view towards the future. And that's not going to change, as he moves to his new position in California. It's great to have him as captain of the full ABC team.

This transcript has been automatically generated and may not be 100% accurate.

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